JP2017009505A - Compact dynamic fatigue testing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact dynamic fatigue testing device capable of conducting tests from an outdoor exposure test to an accelerated deterioration test over a wide range of conditions so as to totally evaluate durability of a building material.SOLUTION: A loading device 6 comprises a movable-side hook 16, a passive-side hook 17 and an eccentric cam 18, a driving transmission device 7 comprises a motor, a gear mechanism and a rotating shaft 39, and a load measuring device 8 comprises a load cell 57. The driving transmission device 7 rotates the eccentric cam 18 so as to periodically load a test piece 3, laid between the movable-side hook 16 and passive-side hook 17, with compressive force and tensile force and also to periodically load the load cell 57 through the movable-side hook 16 and passive-side hook 17, and the load cell 57 measures the applied load.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a small-sized dynamic fatigue test apparatus, and in particular, in order to evaluate the durability of building materials such as waterproofing materials, sealing materials, building finishing materials, etc., a load consisting of repeated loads is applied to a test specimen. The present invention relates to a compact dynamic fatigue testing apparatus for building materials for performing a deterioration test.

  To evaluate the durability of building materials, it is necessary to carry out a deterioration test that combines weather deterioration (deterioration due to heat, moisture, ultraviolet rays, etc.) and repeated deformation fatigue. Conventionally, as a waterproof material durability test, a building finish material fatigue tester in the waterproof material field is known.

  For example, as a deterioration test apparatus for a sealing material, a deterioration test apparatus that gives repeated deformation fatigue using a temperature change of a shape memory spring as a drive source for deforming a test body is known (see Patent Document 1).

  By the way, conventionally, various testing machines are known for evaluating the durability of various materials, but most of them use hydraulic pressure as a drive source. For example, as a fatigue tester and a material tester, a tester that applies a load to a test piece repeatedly using hydraulic drive is known (see Patent Documents 2 and 3).

Japanese Patent No. 5018742 Japanese Patent Laid-Open No. 5-60668 JP-A-9-61325

  Although the deterioration test apparatus for the sealing material described in Patent Document 1 can perform a combined deterioration test, the temperature use region of the shape memory spring capable of loading repeated deformation fatigue is about 30 to 90 ° C. and 30 ° C. The following low temperature load is impossible.

  In addition, because the energy used as a power source for deformation is a temperature change, repeated deformation fatigue cannot be applied at a constant deformation amount and at a constant speed in an outdoor environment where the temperature conditions change, and there is limited versatility. Can only be implemented. In the case of a waterproof material having high strength, the shape memory spring cannot be loaded.

  By the way, as described above, a testing machine using hydraulic pressure has been conventionally used in many fatigue testing machines. However, since a hydraulic device is required as a drive source, the entire testing machine is complicated and large. And the cost increases.

  Therefore, it is difficult to carry in order to test in various weather environments (simulated weather environment such as a laboratory, local actual weather environment), and is not suitable for a combined deterioration test of weather deterioration. There is also a problem that it is difficult to obtain easily in terms of cost.

  The present invention aims to solve the above-mentioned conventional problems, and in order to comprehensively evaluate the durability of building materials such as waterproofing materials, the accelerated exposure test (artificial deterioration) to the accelerated deterioration test (artificial deterioration). It is an object of the present invention to realize a small dynamic fatigue testing apparatus that contributes to a composite deterioration test that can be tested in a wide range of conditions up to (deterioration).

More specific problems that should be realized with regard to a small dynamic fatigue testing apparatus for building materials are as follows.
(1) Various combined deterioration tests of weathering and repeated deformation fatigue of waterproofing materials are possible.
(2) To be portable by hand and to be able to test both at home and abroad, the size should be reduced to a palm-sized, lighter, portable, and cost-saving compared to conventional testing equipment.

(3) Have the following test performance.
A. Regarding the deformation amount and deformation speed control of the test body, repeated deformation fatigue can be applied with the determined deformation amount, and the speed control from low speed to high speed should be possible.
A. With regard to the load capacity, high strength waterproof materials must be capable of fatigue deformation.
C. It can be used even in a temperature environment of a wide temperature range, and can be driven even in a temperature environment of 30 ° C. or less, which is difficult to use in Patent Document 1.

  In order to solve the above-described problems, the present invention provides a load applying device that applies a load to a test object to be tested, a drive transmission device that generates a driving force for applying the load, and transmits the driving force to the load applying device. A small dynamic fatigue testing device comprising a load measuring device that measures a load, and a frame on which the load applying device, the drive transmission device, and the load measuring device are arranged. The load applying device includes a movable hook, a passive The drive transmission device includes a motor, a rotation shaft that rotates the eccentric cam, and a gear mechanism that transmits the rotation of the motor to the rotation shaft. The load measuring device includes a load cell provided between a hook that is passive and immobile with respect to the passive side hook, and an eccentric cam is rotated by a drive transmission device, and the movable side hook and the passive side hook are Dressed in between A load consisting of compressive force and tensile force is periodically applied to the test specimen, and a load consisting of compressive force and tensile force is periodically applied to the load cell via the movable side hook and the passive side hook. Provided is a small dynamic fatigue testing apparatus characterized in that a load is measured by a load cell.

  The movable side hook has a concave-shaped main body part and a pair of hook parts protruding so as to face each other on the opening side of the main body part, and the passive side hook is a concave-shaped main body part and a main body part. A pair of hook portions protruding so as to face each other on the opening side, and the pair of hook portions of the movable side hook and the pair of hook portions of the passive side hook are arranged on the table so as to face each other. The test body is sandwiched between the first plate and the second plate, and in the mounting between the movable side hook and the passive side hook of the test body, the first plate is The second plate is configured to be able to engage with the pair of hook portions of the passive side hook, and to be in contact with the pair of hook portions of the movable side hook. It is preferable.

  The passive side hook preferably has a configuration in which a regulating bolt is screwed to the main body portion, and the tip of the regulating bolt can be opposed to the second plate.

  The gear mechanism preferably includes a cylindrical worm fixed to the motor output shaft and a worm wheel fixed to the rotation shaft.

  The frame includes a base, a column that stands on the base, and a table that is horizontally supported above the base by the column, and the load applying device is disposed on the table and includes a movable side hook. The passive hook is movable on the table, the load cell mounting plate is fixed on the table, the drive transmission device is arranged on the base, and the rotation axis is perpendicular to the table from the base. It is preferable that it is the structure extended in this.

  A test body is a waterproofing material, a sealing material, or a building finishing material as an example.

According to the small dynamic fatigue testing apparatus of the present invention, the following effects are produced.
(1) In order to comprehensively evaluate the durability of the waterproof material, it can be used for a composite deterioration test that can be tested under a wide range of conditions from an outdoor exposure test (actual deterioration) to an accelerated deterioration test (artificial deterioration).

(2) Since a simple drive source that uses a motor and cam mechanism is used, the overall structure of the device is simplified, making it possible to reduce costs compared to conventional test devices, and downsizing to the palm of the hand, It can be made lighter and portable, and it can be tested by carrying it around the world.

(3) Since the motor is used as the drive source, the deformation amount and deformation speed control of the specimen can be stably applied with the determined deformation amount for repeated deformation fatigue, and the speed can be controlled from low to high speed. It became.

  Since it uses a motor and cam mechanism, it can be used even in a wide temperature range, and can be driven in a temperature environment of 30 ° C or less, which is difficult to use in Patent Document 1 and so on. With regard to, even a high-strength waterproofing material can have a strength capable of fatigue deformation.

It is a figure which shows the top view of the Example of the small dynamic fatigue test apparatus which concerns on this invention. The AA sectional view of Drawing 1 of the small size dynamic fatigue testing device of the above-mentioned example is shown. The side view of the small dynamic fatigue test apparatus of the said Example is shown. It is a figure which shows the gear mechanism of the drive transmission apparatus of the said Example, (a) is AA sectional drawing of FIG. 3, (b) is a figure explaining the principal part of FIG.

  DESCRIPTION OF EMBODIMENTS Embodiments for carrying out a small dynamic fatigue testing apparatus according to the present invention will be described below with reference to the drawings based on examples.

  The small dynamic fatigue testing apparatus for building materials according to the present invention is an apparatus for performing a deterioration test by repeatedly applying a load to the building material in order to evaluate the durability of the building material. Waterproofing materials, sealing materials, caulking materials, architectural finishing materials, etc. As the shape of the test body, there are various modes such as a lump shape (the outer shape is a rectangular parallelepiped, etc.), a band shape, a film shape, and a plate shape.

  An embodiment of a small dynamic fatigue testing apparatus according to the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 3, the small dynamic fatigue test apparatus 1 applies a load to a frame 2, a load applying apparatus 6 that applies a load to a test body 3 such as a waterproof material that is a subject of a fatigue test, and a load. And a load measuring device 8 that measures the content of the load including the magnitude, number of times, interval, and time of the applied load.

  As shown in FIGS. 2 and 3, the frame 2 includes a base 11, four struts 12 standing on the base 11, and a table 13 supported horizontally via the struts 12. Yes. In this specification, for convenience of explanation, in FIG. 1, the upper side is the front, the lower side is the rear, and the left and right are the left and right directions toward the front.

  The load applying device 6 and the load measuring device 8 are arranged on the table 13. The load measuring device 8 is arranged in front of the table 13, and the load applying device 6 is arranged behind the load measuring device 8. The drive transmission device 7 is mainly disposed on the base 11.

  As shown in FIG. 1, the load application device 6 includes a movable side hook 16, a passive side hook 17, and an eccentric cam 18.

  The movable hook 16 includes a main body portion 21 and a pair of hook portions 22. The main body portion 21 includes left and right side portions 23 and a rear portion 24 that bridges the left and right side portions 23, and is formed in a concave shape in a plan view as shown in FIG. The pair of hook portions 22 are formed to protrude left and right so as to face each other on the opening side of the main body portion 21, that is, on the opening side between the left and right side portions 23 of the main body portion 21.

  Left and right fixing bolts 28 are screwed onto the left and right side portions 23 of the main body 21 so that the tips thereof face each other. As will be described later, the fixing bolt 28 has a function of tightening and fixing the first plate 29 holding the test body 3 from the side.

  The movable hook 16 is disposed on the table 13 with the pair of hook portions 22 facing forward, and is movable in the front-rear direction on the table 13 when the eccentric cam 18 rotates. Guide rails 33 extending in the front-rear direction are provided on the left and right sides of the table 13 as guide means for guiding the movable hook 16 in the front-rear direction. The guide means is not limited to the guide rail 33 as shown in FIGS. 1 and 2, but may be a guide roller (not shown).

  On the table 13, an eccentric cam 18 is provided horizontally in a region surrounded by the movable hook 16 in plan view. As shown in FIG. 2, the eccentric cam 18 is formed in a substantially cylindrical shape as a whole, and is integrally formed from a large-diameter cam portion 34 and a small-diameter support portion 35. A cam surface 38 is formed on the side peripheral surface of the cam portion 34 so as to be recessed slightly toward the axis.

  The eccentric cam 18 is eccentrically fixed to the upper part of the rotation shaft 39 of the drive transmission device 7. As shown in FIG. 2, a screw hole 40 is formed in the eccentric cam 18 toward the side. A clamping screw 41 is screwed into the screw hole and pressed against the rotating shaft 39, thereby the eccentric cam. The 18 rotation shafts 39 are prevented from rotating. The support portion 35 supports the upper end portion of the rotation shaft 39.

  The eccentric cam 18 has specifications such that the cam surface 38 has a diameter of 30 mm and an eccentric amount of 3.6 mm, for example. However, it is necessary to select and use the eccentric cam 18 having an appropriate specification according to various test conditions such as the type of the test body 3, the test purpose, the load applied to the test body 3, and environmental conditions. is there.

  In the small dynamic fatigue testing apparatus 1 according to the present invention, the tightening screw 41 is loosened, and the eccentric cam 18 having different specifications (for example, the eccentric amount is different from 1.2 mm, 2.4 mm, 3.6 mm, etc.). The configuration can be freely replaced.

  Similarly to the movable hook 16, the passive hook 17 includes a main body 45 and a pair of hooks 46. The main body portion 45 includes left and right side portions 47 and a front portion 48 that bridges the left and right side portions 47, and is formed in a concave shape in plan view as shown in FIG.

  The pair of hook portions 46 are formed to protrude left and right so as to face each other on the opening side of the main body portion 45, that is, on the opening side between the left and right side portions 47 of the main body portion 45.

  Fixing bolts 52 are screwed onto the left and right side portions 47 of the main body 45 so that the tips thereof face each other. As will be described later, the fixing bolt 52 has a function of fastening the second plate 30 sandwiching the test body 3 from the side and fixing it.

  A pair of right and left regulating bolts 53 are screwed onto the front portion 48 of the main body 45 of the passive hook 17 from the front to the rear. The restriction bolt 53 has a function of tightening the second plate 30 sandwiching the test body 3 from the front to restrict the relative movement of the second plate 30 to the front with respect to the passive hook 17.

  The passive side hook 17 is disposed on the table 13 so as to face the pair of hook portions 22 of the movable side hook 16 with the pair of hook portions 46 facing rearward. When the eccentric cam 18 rotates on the passive side hook 17, a forward force is applied via the first plate 29, the test body 3, the second plate 30, and the regulating bolt 53, and the movable side is also movable. Since a force acts backward through the hook 17, the first plate 29, the test body 3, and the second plate 30, it can move in the front-rear direction on the table 13.

  The load measuring device 8 includes a load cell mounting plate 56, a load cell 57 for measuring a load, and a spacer 58. The load cell mounting plate 56 includes a bottom portion and an upright portion, and is formed in an L shape in a side view. The bottom of the load cell mounting plate 56 is fixed on the table 13 with bolts.

  The load cell 57 is provided so that a screw 59 protrudes from the front and rear thereof, the front screw 59 is screwed to the standing portion of the load cell mounting plate 56, and the rear screw 59 is screwed to the spacer 58. .

  The spacer 58 is provided so that the bolt 63 protrudes rearward, and the bolt 63 is fastened to the front portion 48 of the main body 45 of the passive hook 17 with a nut. Thus, the load cell 57 is fixed to the load cell mounting plate 56 before and after the load cell 57 and is fixed to the passive hook 17 via the spacer 58.

  As shown in FIGS. 1 and 3, one end of an output line 64 that outputs a measured load is connected to the load cell 57, and the other end of the output line 64 is connected to a personal computer 65. The technique for calculating the measurement data of the load applied to the load cell 57 by the personal computer 65 is a well-known technique, and the well-known technique is also used in the small dynamic fatigue test apparatus 1 according to the present invention.

  That is, if the computer 65 is equipped with software for calculating the load (compression force and tensile force) applied to the specimen 3 based on the measurement data input from the output line 64, the measurement data measured by the load cell 57 Based on the above, the load applied to the test body 3 is calculated, and the content of the load including the magnitude, number, interval, and time of the load to be applied is acquired and can be displayed as necessary.

  As shown in FIGS. 1 to 4, the drive transmission device 7 includes a motor 67, an output shaft 68 of the motor 67 that is rotationally driven by the motor 67, a cylindrical worm 69, and a worm wheel 70 that meshes with the cylindrical worm 69, And the rotary shaft 39 described above. Here, the cylindrical worm 69 and the worm wheel 70 constitute a gear mechanism 73 that transmits the rotation of the motor 67 to the rotary shaft 39.

  As shown in FIG. 3, the motor 67 is attached to a motor attachment plate 75 having an L-shaped cross section fixed to the lower surface of the table 13. As will be described later, the motor 67 is provided with a speed reducer or a transmission so that the output speed of the motor 67 can be reduced or changed. Alternatively, the motor 67 is preferably connected to a motor control means that can electrically change the rotational speed (number of rotations) of the motor 67.

  As shown in FIG. 3, the output shaft 68 of the motor is provided so as to extend laterally and horizontally from the motor 67, and its rear end portion is attached to a bearing 72 on a support plate 71 fixed to the lower surface of the table 13. It is rotatably supported. The cylindrical worm 69 is fixed to the output shaft 68 of the motor coaxially (coincided with the axial center). The worm wheel 70 is coaxially fixed to the rotating shaft 39.

  As shown in FIG. 2, the rotary shaft 39 is rotatably attached to a support plate 76 having an L-shaped cross section fixed to the lower surface of the table 13 by a bearing 77, and can be rotated to the table 13 by a bearing 77. The upper part of the rotating shaft 39 that is attached extends upward from the table 13, and the eccentric cam 18 is attached on the table 13 as described above.

  The rotation of the motor 67 rotates the eccentric cam 18 via the motor output shaft 68, the cylindrical worm 69, the worm wheel 70, and the rotation shaft 39, thereby applying a load to the test body 3. If a means for changing the rotation speed of the output shaft 68 of the motor 67 (referred to as output rotation speed, which is also the output rotation speed) is provided, the rotation speed of the eccentric cam 18 per unit time can be changed.

  As a result, the number of times the load is applied to the test body 3 within the unit time can be changed, and as a result, the total amount of load applied to the test body 3 within the predetermined test time can be adjusted.

  As means for changing the output rotation speed of the motor 67, well-known means is used. As well-known means, for example, the output shaft 68 of the motor 67 is connected to a gear transmission or a continuously variable transmission (not shown) for changing its rotational speed.

  Other known means for electrically controlling the rotational speed of the motor 67 itself include resistance control (controlling the voltage supplied to the motor 67 with a voltage regulator) and pulse control (voltage supplied to the motor 67). There are means for controlling the duty of the pulse (ratio of pulse on / off time).

  As a motor provided with control means for electrically controlling the rotational speed in this way, for example, there is a motor such as PTM-24AG with a reduction gear sold by Nippon Pulse Motor Co., Ltd., and a small dynamic fatigue testing apparatus according to the present invention 1 motor 67 can be used.

  Although not shown in the drawings, a rechargeable battery may be attached to the small dynamic fatigue test apparatus 1. With such a configuration, it can be used even in an environment without a power source.

(Function)
The operation of the small dynamic fatigue testing apparatus 1 having the above configuration will be described. The test body 3 to be tested is prepared in a state of being sandwiched and bonded (called sandwiched) between the first plate 29 and the second plate 30. For example, when a waterproof material or the like having a bonding function by itself is sandwiched between the first plate 29 and the second plate 30, it is bonded to both plates.

  In order to evaluate the durability of the test body 3 using the small dynamic fatigue test apparatus 1, a deterioration test is performed by repeatedly applying a load consisting of a compressive force and a tensile force to the test body 3. The body 3 is set (mounted) between the movable hook 16 and the passive hook 17 on the table 13.

  Specifically, in this set, the first plate 29 is brought into contact with the concave cam surface 38 of the eccentric cam 18 on its rear surface, and on the rear side of the hook portion 22 of the movable side hook 16. It is inserted into the movable side hook 16 so that it can be positioned and engaged, and the side face of the first plate 29 is fastened with the fixing bolt 28 from the left and right sides and placed.

  At the same time, the second plate 30 is inserted into the passive side hook 17 so that its rear surface can be engaged with the front side of the hook part 46 of the passive side hook 17 and is fixed from the left and right sides. At 52, the side surface of the second plate 30 is tightened and placed. Further, the pair of right and left restricting bolts 53 are rotated to contact the front surface of the second plate 30 at their tips, thereby restricting relative movement of the second plate 30 with respect to the passive hook 17.

  When the deterioration test is started after setting the test body 3 in the small dynamic fatigue testing apparatus 1 in this way, the motor 67 is started. When the motor 67 is started, the rotation is transmitted through the output shaft 68, the cylindrical worm 69, the worm wheel 70, and the rotating shaft 39, and the eccentric cam 18 rotates.

  When the eccentric cam 18 rotates and the surface of the cam surface 38 of the eccentric cam 18 having a large eccentric distance from the shaft center comes into contact with the first plate 29, the specimen is passed through the first plate 29. 3 is compressed. A compressive load that causes deformation fatigue is applied to the test body 3 by the compressive force generated by the compression of the test body 3.

  In addition, a compression load is applied to the load cell 57 through the test body 3, the second plate 30, the regulating bolt 53, the movable hook 16 and the spacer 58 by this compression.

  The compression load applied to the load cell 57 is taken out from the load cell 57 as an electrical output through the output line 64, and the magnitude of the compression load is measured by the personal computer 65. Thus, based on the compression load measured by the load cell 57, the compression load applied to the test body 3 is grasped.

  When the eccentric cam 18 rotates and a surface of the cam surface 38 having a large eccentric distance from the axial center comes into contact with the rear portion 24 of the main body portion 21 of the movable side hook 16 and presses backward, the movable side hook 16 moves rearward and pulls the test body 3 rearward through the hook portion 22 of the movable side hook 16 and the first plate 29.

  A tensile load that causes deformation fatigue is applied to the test body 3 by the tensile force caused by the tension. Further, by pulling the test body 3, the second plate 30 comes into contact with the hook portion 46 of the passive side hook 17 to pull the passive side hook 17 backward, and further, a tensile load is applied to the load cell 57 via the spacer 58. give.

  The tensile load applied to the load cell 57 is taken out as an electrical output from the load cell 57, and the magnitude of the tensile load is measured by the personal computer 65. Thus, based on the tensile load measured by the load cell 57, the tensile load applied to the test body 3 is grasped.

  When the eccentric cam 18 makes one rotation, a compressive load and a tensile load are alternately applied to the test body 3, and when the eccentric cam 18 rotates a plurality of times, a compressive load that causes deformation fatigue of the test body 3 A load consisting of a tensile load is repeatedly applied to the test body 3 a plurality of times.

  The above is a mode in which the small dynamic fatigue test apparatus 1 repeatedly and periodically applies a load to the test body 3 to perform the deterioration test. In fact, in order to evaluate the durability of the test body 3, The size is adjusted in advance. This adjustment is performed by setting in advance the magnitude of one load applied to the specimen 3 and the number of repetitions of applying the load.

  Adjustment of the magnitude | size of the one time load given to the test body 3 is performed by selecting from the eccentric cam 18 from which eccentricity differs.

  The number of repetitions of applying the load is adjusted by adjusting the conditions of the number of times of applying the load per unit time and the duration of the load test. The number of times the load is applied per unit time is determined by adjusting the rotation speed of the output shaft 68 of the motor 67 by the gear transmission, the electric motor rotation speed control means, and the like.

  Further, in the test body 3, weather environment conditions such as temperature and humidity also cause deformation fatigue. Therefore, when the deterioration test is performed with the weather environment conditions set in advance in addition to the conditions such as the one-time load size and the number of times of repeatedly applying the load, a more detailed combined durability evaluation in accordance with the reality. Is possible.

  The weather environment conditions may be carried out in a laboratory that simulates the weather environment, but the small dynamic fatigue test apparatus 1 of the present invention is compact and easy to transport, so it is transported to cold and high temperature areas. In this way, the weather environment condition can be subjected to a combined deterioration test in an actual weather environment.

  In addition, as described above, the conventional sealing material deterioration test apparatus described in Patent Document 1 cannot use a low temperature load of 30 ° C. or less in the temperature use region of the shape memory spring that can be subjected to repeated deformation fatigue. is there. Further, deformation fatigue cannot be stably applied at a constant deformation amount and a constant speed, and can be carried out only under limited conditions without versatility.

  However, the small dynamic fatigue testing apparatus 1 of the present invention can be stably driven even under a temperature environment in which the usable temperature range is 30 ° C. or less, and deformation fatigue can be determined by changes in the temperature environment. It can be loaded with the deformation amount, and the deformation speed control can be loaded at a constant speed, and deformation fatigue can be loaded at a constant deformation amount and a constant speed.

  In addition, in order to demonstrate the small dynamic fatigue test apparatus according to the present invention, the present inventor made a prototype of the small dynamic fatigue test apparatus 1. In this prototype, specific specifications were made, and the cam surface 38 of the eccentric cam 18 had a diameter of 30 mm and an eccentric amount of 3.6 mm.

  With regard to deformation speed control, it is possible to control the speed from low speed (1 time / day) to high speed (6 times / minute), and the load resistance (high strength waterproof material) is a strength capable of fatigue deformation even with a high strength waterproof material. The load capable of causing fatigue deformation) was a performance having a maximum strength of 100 N (10.197 kgf).

  As for the size, the approximate dimensions are 150 mm in front and back, 10 mm in width, and 100 mm in height. It is extremely compact and lightweight compared to conventional fatigue testing devices, and can achieve palm-sized dimensions. did it.

  In addition, the conventional fatigue test apparatus using a hydraulic pressure may be able to achieve a maximum load strength of 100 N. However, it is considered difficult to achieve a compact size comparable to that of the small dynamic fatigue testing device according to the present invention in the configuration of the conventional fatigue testing device using hydraulic pressure, but the compact size could be realized temporarily. Even so, with such a compact size, the maximum strength of 100 N as in the present invention cannot be realized.

  Further, in the configuration of the conventional fatigue test apparatus using the shape memory spring, even if a compact size comparable to that of the small dynamic fatigue test apparatus according to the present invention can be realized, as long as the shape memory spring is used, the present invention Thus, it is difficult to have functions such as deformation speed control and displacement amount control for the specimen.

  According to the present invention, it is possible to achieve a maximum load strength of 100 N in spite of an extremely compact small-sized dynamic fatigue test apparatus 1 having a palm size.

  According to the configuration of the small dynamic fatigue testing apparatus according to the present invention described above, the three characteristic performances of being capable of controlling the deformation speed and the amount of displacement of the test body and having a higher load resistance are provided. Demonstrate. That is, the small dynamic fatigue testing apparatus controls or replaces the motor 67 to control the deformation speed, controls the displacement amount by the eccentric amount of the eccentric cam 18, and retains high load resistance by the gear mechanism.

  The embodiment for carrying out the small dynamic fatigue testing apparatus according to the present invention has been described based on the examples. However, the present invention is not limited to such examples, and It goes without saying that there are various embodiments within the scope of the technical matters described in.

  Since the small dynamic fatigue testing apparatus according to the present invention is configured as described above, it is not only a deterioration test for building materials such as waterproofing materials, sealing materials, caulking materials, and building finishing materials, but also other durability evaluations. Can be used for deterioration testing of various materials such as civil engineering materials, mechanical materials, and chemical plant materials.

1 Small dynamic fatigue testing equipment
2 frames
3 specimens
6 Load applying device
7 Drive transmission device
8 Load measuring device
11 base
12 props
13 tables
16 Movable hook
17 Passive hook
18 Eccentric cam
21 Movable hook body
22 Hook part of movable side hook
23 Left and right sides of the main body of the movable hook
24 Rear part of movable hook body
28 Stationary bolt
29 First plate
30 Second plate
33 Guide rail
34 Cam part
35 Supporting part
38 Cam surface
39 Rotating shaft
40 Eccentric cam screw hole
41 Tightening screw
45 Passive side hook body
46 Hook of passive hook
47 Left and right sides of the passive hook body
48 Front part of passive hook body
52 Stationary bolt
53 Regulatory bolt
56 Load cell mounting plate
57 load cell
58 Spacer
59 Load cell screw
63 Spacer bolt
64 output lines
65 PC
67 Motor
68 Motor output shaft
69 Cylindrical worm
70 Worm wheel
71 Output shaft support plate
72 Output shaft bearing 73 Gear mechanism
75 Motor mounting plate
76 Rotating shaft support plate
77 Rotary shaft bearings

Claims (6)

A load applying device that applies a load to a test object to be tested, a drive transmission device that generates a driving force for applying the load and transmits the load to the load applying device, a load measuring device that measures the applied load, and a load applying A small dynamic fatigue testing device comprising a device, a drive transmission device and a frame on which a load measuring device is arranged
The load applying device includes a movable side hook, a passive side hook, and an eccentric cam.
The drive transmission device includes a motor, a rotating shaft that rotates the eccentric cam, and a gear mechanism that transmits the rotation of the motor to the rotating shaft.
The load measuring device includes a load cell that is provided between a load cell mounting plate that is passive with respect to the hook and the passive side hook,
The eccentric cam is rotated by the drive transmission device, and a load consisting of compressive force and tensile force is periodically applied to the specimen mounted between the movable side hook and the passive side hook. A small dynamic fatigue testing apparatus characterized in that a load consisting of a compressive force and a tensile force is periodically applied via a hook and a passive hook, and the load is measured by a load cell. The movable side hook has a concave-shaped main body part and a pair of hook parts protruding so as to face each other on the opening side of the main body part,
The passive side hook has a concave body part and a pair of hook parts protruding so as to face each other on the opening side of the body part,
The pair of hook parts of the movable side hook and the pair of hook parts of the passive side hook are arranged on the table so as to face each other,
The test body is sandwiched between the first plate and the second plate,
In the mounting between the movable side hook and the passive side hook of the test body, the first plate comes into contact with the cam surface of the eccentric cam and can engage with the pair of hook portions of the movable side hook. 2. The small dynamic fatigue testing apparatus according to claim 1, wherein the two plates are configured to be engageable with a pair of hook portions of the passive hook.   The passive hook has a configuration in which a regulating bolt is screwed to a main body portion thereof, and a tip of the regulating bolt is configured to be able to abut against the second plate. Small dynamic fatigue testing equipment.   4. The small dynamic fatigue according to claim 1, wherein the gear mechanism includes a cylindrical worm fixed to the motor output shaft and a worm wheel fixed to the rotating shaft. Test equipment. The frame includes a base, a column that stands on the base, and a table that is horizontally supported above the base by the column.
The load applying device is disposed on the table, and the movable side hook and the passive side hook are movable on the table,
The load cell mounting plate is fixed on the table,
5. The compact dynamic transmission device according to claim 1, wherein the drive transmission device is disposed on a base, and the rotation shaft extends vertically from the base to above the table. Fatigue test equipment.   The small dynamic fatigue testing apparatus according to claim 1, wherein the test body is a waterproof material, a sealing material, or a building finishing material.

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